NO RESPONSE FROM HFM (HANDS FREE MODULE) - START/STOP
 |
For a complete wiring diagram, refer to the Wiring Information.
Possible Causes |
|---|
| (A977) FUSED B(+) CIRCUIT OPEN OR SHORTED |
| (Z916) GROUND CIRCUIT OPEN |
| (D264) AND (D265) CAN INTERIOR BUS (125K) CIRCUITS OPEN |
| HANDS FREE MODULE |
1. TEST FOR INTERMITTENT CONDITION
| NOTE: | Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing. |
| 1. | Turn the ignition on. |
| NOTE: | Make sure the battery voltage is between 10.0 and 16.0 volts. |
| 2. | With the scan tool, read the module status. |
| NOTE: | Check the TIPM for any active CAN hardware DTCs, perform DTC before proceeding. |
Does the scan tool indicate that the module is active on the bus?
Yes
- The no response condition is not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
No
- Go To 2
2. CHECK THE (A977) FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
 |
| 1. | Turn the ignition off. |
| 2. | Disconnect the Hands Free Module harness connector. |
| 3. | Using a 12-volt test light connected to ground, check the (A977) Fused B(+) circuit. |
Does the test light illuminate brightly?
Yes
- Go To 3
No
- Repair the open or short in the (A977) Fused B(+) circuit.
-
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).
3. CHECK THE (Z916) GROUND CIRCUIT FOR AN OPEN
 |
| 1. | Using a 12-volt test light connected to 12-volts, check the (Z916) Ground circuit. |
Does the test light illuminate brightly?
Yes
- Go To 4
No
- Repair the open in the (Z916) Ground circuit.
-
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).
4. CHECK THE (D265) AND (D264) CAN INTERIOR BUS (125K) CIRCUITS FOR AN OPEN
 |
| 1. | Disconnect the TIPM C7 harness connector. |
| 2. | Measure the resistance of the (D264) CAN Interior Bus (-) (125K) circuit between the TIPM C7 harness connector and the HFM harness connector. |
| 3. | Measure the resistance of the (D265) CAN Interior Bus (+) (125K) circuit between the TIPM C7 harness connector and the HFM harness connector. |
Are the resistances below 5.0 Ohms for both circuits?
Yes
- Replace the Hands Free Module in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Repair the open in the (D265) or (D264) CAN Interior Bus (125K) circuit. Inspect the connector for damage.
-
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).